Rubber properties – Standard test method for Hardness 1- Test method involves A, Б, Ц, Д, DO, E, M, O, OO, OOO, OOO-S and R 12 (Diauroch) hardness tests and procedures for determining the indentation hardness of substances according to the classification of rubber, net materials, elastic materials, thermoplastic materials and certain hard plastics.
Значење и сврха
4.1 The test method is based on the penetration of a specific type of indentation when forced into the material under specific conditions. Indentation hardness is inversely proportional to penetration and depends on the elastic modulus and viscoelastic behavior of the material. The geometry of the indenter and the forces applied can affect the measurements, so there is no simple relationship between the measurements obtained using one hardness tester and those obtained using another hardness tester or other instruments used to measure hardness. The test method is an empirical test primarily used for control purposes. There is no simple relationship between the indentation hardness determined by this test method and any basic characteristics of the tested material. For specification purposes, it is recommended that test method D785 be used for materials other than those described in 1.1.

Обим
1.1 The test method covers twelve types of rubber hardness measuring equipment called durometers: type A, Б, Ц, Д, DO, E, M, O, OO, OOO, OOO-S and R. Procedures for determining the indentation hardness of substances classified as thermoplastic elastomers, vulcanized (thermoset) гума, elastomeric materials, porous materials, gel-like materials and certain plastics are also described.

1.2 This test method is not equivalent to other indentation hardness methods and instrument types, in particular those described in Test Method D1415.

1.3 This test method is not applicable to the test of coated fabrics.

1.4 All materials, instruments or equipment used to determine mass, force or size shall be traceable to the National Institute of Standards and Technology or other internationally recognized organization of a similar nature.

АСТМ Д 2240-2021 “Rubber Properties – Standard Test Method for Hardness 1- (Diauroc) Тестер тврдоће”

1.5 Values expressed in SI units should be considered standard values. Вредности дате у заградама су само за референцу. Many of the stated dimensions in SI were translated directly from the US customary system to fit instruments, practices, and procedures that existed prior to the 1975 Metric Conversion Act.

1.6 Овај стандард није намењен решавању свих безбедносних питања, ако их има, повезана са његовом употребом. Одговорност корисника овог стандарда је да успостави одговарајућу безбедност, здравствене и еколошке праксе и да се утврди применљивост регулаторних ограничења пре употребе.

1.7 Овај међународни стандард је развијен у складу са међународно признатим принципима стандардизације утврђеним у Одлуци о принципима за израду међународних стандарда., Смернице и препоруке које је издао Комитет за техничке баријере у трговини Светске трговинске организације.